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Finding the Fourth Proportional to 386,681.95, 579,979.95 and 120,420.17

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Solution

The fourth proportional to 386,681.95, 579,979.95 and 120,420.17 is: 180,616.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,681.95 : 579,979.95 = 120,420.17 : x
  2. Step 2: Convert to fraction form
    386,681.95/579,979.95 = 120,420.17/x
  3. Step 3: Cross multiply
    386,681.95x = 579,979.95 × 120,420.17
  4. Step 4: Simplify right side
    386,681.95x = 69,841,282,999.04
  5. Step 5: Solve for x
    x = 69,841,282,999.04/386,681.95
  6. Step 6: Final answer
    x = 180,616.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.